German Field Telephone Switchboard combined answering jack and signal unit; one complete and one showing mechanism. This photograph was taken on December 13, 1918, by Sgt. Gallivan, The location is Research and Inspection Bureau in Paris, Seine, France. This image is not for publication and is intended for official use only.

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Size: 8445px × 5681px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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